docs: def set_until(self, date):
          """ Sets 'until' parameter used to return \
          only tweets generated before the given date
  
          :param date: A datetime instance
          :raises: TwitterSearchException
          """
  
          if isinstance(date, datetime.date) and date <= datetime.date.today():
              self.arguments.update({'until': '%s' % date.strftime('%Y-%m-%d')})
          else:
              raise TwitterSearchException(1007)